undercurrent (n.)

• affect
• affection
• affluence
• allegory
• allusion
• ambiance
• ambience
• assumption
• atmosphere
• aura
• challenge
• coloration
• concourse
• confluence
• conflux
• connotation
• contention
• contradiction
• contravention
• counteraction
• counterbalance
• counterblast
• countercurrent
• counterpoise
• counterweight
• course
• crosscurrent
• crossing
• current
• denial
• downdraft
• downpour
• draft
• drift
• driftage
• emotion
• experience
• feeling
• flavor
• flow
• flowing
• fluency
• flux
• foreboding
• gush
• heartthrob
• hint
• implication
• import
• impression
• inference
• inflow
• inhalation
• innuendo
• inrush
• inspiration
• intimation
• meaning
• millrace
• monsoon
• murmur
• negation
• nuance
• onrush
• opposition
• outflow
• overtone
• passion
• pitfall
• presentiment
• presumption
• presupposition
• race
• reaction
• rebuttal
• refusal
• rejection
• resistance
• response
• rocks
• run
• rush
• sandbank
• sandbar
• sands
• sensation
• sense
• sentiment
• set
• spate
• stream
• suggestion
• supposition
• surge
• symbolism
• tendency
• tenor
• tide
• tinge
• touch
• traversal
• trend
• undertone
• undertow
• updraft
• vibes
• wind